Blowtorch



Patented Feb. 23, 1926.

UNITI-En STAT as CLIFFORD V. ROYALJ, OFlRICI-IMOND, VIRGINIA.

Lowroncn.

Application filed January 21, 1925. serial No. 3,853.

To cZZ whom it may concern.'

Be it known thatl, Current) V. ROYALL, a citizen of the United States,residing `at Richmond, inthe countyof Henrico and `State of vlilirginia,have invented certain new and useful Improvements in Blowtorches, Vofwhich the'following is a specilication.

This invention relates to a blow torch `for pre-heating in acetylenewelding and isdesignedpri-marily for heating metallic sheets, bars,plates, etc., or kfor heat-ing any other objects for whiehit is foundapplicable, and

' the invention has foritsvobject to provide,

in a manner as hereinafter set forth, a torch of the class referred tofor burning, when employed, low grades of'oil effectively andefficiently, and further for overcoming the necessity of the pre-heatingof the torch when starting.

A furthe-r object of the invention is to provide, in a manner ashereinafter. setforth,

a torch of the` class referred to, whereby air at atmospheric pressureisdrawn into the combustion chamber of the burner, on the supply theretoof a combustible mixture under pressure, said combustiblemixtureconsisting of compressed air4 andfuel oil, and with the air underatmospheric lpressure as it enters such chamber. admiXing with thecombustible mixture to insure proper combustion thereby providing for fathoroughly efficient torch, and further effecting a material saving inthe expenseof fnelby the use of fuel oil in lieu of kerosene andgasoline.

Further .objects of the invention are vto provide, in a manner ashereinafter setforth, a blow torch, vwhich is simple in its constructionand arrangement, strong, durable, compact, thoroughly e'licient andconvenient in its use, lreadily assembled and Acomparatively inexpensivetol manufacture.

lVith the foregoing and other objects -in view, the inventionV consistsof vthe `novel construction, combination and arrangement of parts, ashereinafter more specifically described and illustrated in theaccompanying` drawings, wherein is shown an embodiment of the invention,but it is to be understood that changes, variations and modincations canbe resorted to which come Within the scope of the claims hereuntoappended.

In the drawings wherein like reference characters denote correspondingparts throughout the several views :W

Figure l .is anelevaton of a blow torch,

` mixing chamber .17.

in accordancewith this invention, showing lthe same connectedto a fueloil and a compressed air tank.

v`Figure -2 is a perspective view of the torch. Figure 13 isalongitudinal sectional view thereof.

Figure 4 is a section on line 4-4, Figure .9 n

AReferring to the drawingsin detail, '1 de- :notes a Ifuel oil tank, 2 acompressed air tank vandjtlie `formeris provided wit-han outlet 3 andthelatterwith an'outlet 4. Thefoutvlets ,3 `and 4 are kconnected togetherby a :feed f pipe .Vi-having interposed Ytherein a pair ofregulati-ngvor controlling valves 6, "Y, of .any suitable construction.`The valve' 6 is arrangedin the pipe 5 between the outlets 'o and I4,andthe `valve 7 is arranged forwa-rdly Hof the outlet 3. Connected toand leading from ,that end 'of the feedpipe 5 which is arranged inproximityto the `valve 7 isa flexiblesupply pipefS, terminating in ahandle 9, ,provided with a passage `10, which Yformsa continuation ofthe pipe 8.

The torch comprises a cylindrical body portion 11, forming a combustionchamber The v'forward end-cof the body jportien 12 terminates inatapered nozzle 13, ,and its rear 4endis provided with an inwardly e5;-tendingrearwardly inclined annular iange 14 provided with a seriesof'spaced ovalshaped slots 15l open `at one side thereofconstitutinginlets for Asupplying air under atmospheric,pressure totheinlet end of the 'combustion chamber 12. VSecured 'to 'the flange 14, aswell as. projecting forwardly and rearwardly with respect thereto is ahollow cylindrical member 16 forming a T he member 16 abuts against the'free edge of the iiange 14 and provides means for closing the open sideof each `ofsaid slots 15. The member 16 is fopenfat itsfforward end andcommunicates with the chamber 12 and has its/.rear end "closed bya'fdisk 18 provided'with a pair of circular"openings "1-9 `and 'furtherformed tion chamber 12. The openings 19 supply air under atmosphericpressure to the combustible mixture supplied into the chamber 17, andthe openings 14 supply air under atmospheric pressure into thecombustion chamber 12 to admix with the combustible mixture suppliedthereto.

The nozzle 21 projects forwardly and rearwardly with respect to the disk18 and is secured to a hollow cap member 22 mounted on one end of thehandle 9. The other end of the handle 9 is provided with a cap member23, to which is connected the pipe 8. The cap members 22 and 23 providemeans for swivelly mounting the handle 9 in position.

The combustible mixture not only includes compressed air andl fuel oil,but also air at atmosphericpressure, which is drawn into the chambers 12and 17 as the mixture is supplied thereto, and the admixing of the airunder.atmospheric pressure, supplied to the eon'ibustibleniixture offuel oil and compressed air provides a proper mixture of air and oil soas to insure efficient combustion. The torch will burn the lower gradesof oil effectively and eliiciently, and as fuel oil can be employed,there is elfected a great saving in cost of fuel by the use of fuel oilover the employment of kerosene and gasolene.

rIhe combustible mixture of fuel oil and compressed air is suppliedthrough a single pipe, and into the mixing chamber 17 rand from there itenters the combustion chamber 12 and the force of the mixture will drawair' at atmospheric pressure through the air inlet openings into thechambers 12 and 17 and the combining of the air at atmospheric pressurewith the oil and compressed air will insure proper combustion, undersuch conditions setting up an efficient torch.

It is thought that the many advantages of a blow torch in accordancewith this invention can be readily understood, and although thepreferred embodiment of the invention is as illustrated and described,yet it is to be understood that changes in the details of constructioncan be had which will y fall within the Scope of the invention as olinedannular flange projecting from the rear end of the body portion andformed with a series of slots open at one side, a hollow cylindricalmember extending through said flange, closing the open sides of saidslots, forming a mixing chamber and having its forward end opening intothe combustion chamber at the rear end thereof, a disk secured to therear end of said member and provided with air inlets, and a` nozzleextending through said disk and opening into said mixing chamber andleading from a combustible mixture supply.I

2. A blow torch comprising a hollow cylindrical body portion providing acombustion chamber, a tapered nozzle extended from the forward end ofsaid body portion, an inwardly extending and rearwardly inclined annularflange projecting from the rear end of said body portion and formed witha series of air inlets, a hollow cylindrical member extending throughand abutting the free edge of said flange, forming` a mixing chamber andhaving its forward end terminating at. and opening into the rear end ofsaid combustion chamber, a disk secured to the rear end of said memberand provided withy air inlets, and a nozzle extending` through said diskcentrally thereof and openinginto said mixing chamber and furtherleading from a combustible mixture supply.

3. A blow torch comprising a hollow cylindrical body portion providing acombustion chamber, a tapered nozzle extended fromthe forward end ofsaid body portion, an inwardly extending and rearwardly inclined annularflange projecting from the rear endof said body portion and formed witha series of air inlets, a hollow cylindrical member extending throughand abutting the free edge of said flange, forming a mixi. ing chamberand having itsforward end ter- Aminatingat and opening into the rear endof said combustion chamber, a disk secured to the rear end of saidmember and provided with air inlets, and a nozzle extending through saiddisk centrally thereof and opening into said mixing chamber and furtherleading froin a combustible mixture supply, the air inlets in saidflange being oval in contour and the air inlets in said disk beingcircular in contour.

In testimony whereof, I afiix my signature here-to.

e. v. noYALL.

